The best way for a steady income, especially when it comes to Bitcoin, is to probably join a signature campaign and always cap out whatever the maximum number of posts a day/week/month is, that way you get a relatively simple and consistent income directly in Bitcoin. Now that doesn't fit your criteria of not doing anything, so that's out of the question.
One potential idea is investing in a casino bankroll and get paid that way. I haven't done it in the past but with enough research I think you'd probably have a good idea of how it would all work.
I agree to you. The best way to have a steady income is to focus on signature campaign work hard to earn and always follow the rules. It's easy and reliable , at the same time if you are earning you can save and invest . So your income will grow more and more. And dont consider gambling/mining as a source of income anymore because it's to risky to gamble what you earn . Just focus and work hard to do your best in signature campaign and you'll have an steady income right away.